Filing the Final Tax Return for the Deceased

Emily called me last week, frantic. Her mother, Patricia, passed away unexpectedly in July. Emily had diligently handled all the estate administration—probate, asset transfers, even the funeral arrangements. But now, the IRS was sending notices demanding Patricia’s 2023 tax return. Emily had no idea where to start, and frankly, feared making a mistake that could jeopardize the estate. The cost of a simple error? Penalties, interest, and a whole lot of unnecessary stress.

As an estate planning attorney and CPA with over 35 years of experience, I’ve seen this scenario countless times. People meticulously plan for asset distribution but often overlook the critical final tax return. It’s not a simple formality; it’s a complex process with specific rules and deadlines that can easily trip up even the most organized executor.

What Income Needs to Be Reported on the Final Tax Return?

The final tax return, typically Form 1040, covers the period from January 1st until the date of death. This includes all income Patricia received during that time – wages, interest, dividends, capital gains, rental income, and even distributions from retirement accounts. It’s crucial to remember that even income earned after death, but credited to Patricia’s account before the estate is settled, must be reported. This can be particularly tricky with things like accrued interest on savings accounts.

How Do You Handle Joint Returns When One Spouse Dies?

If Patricia filed a joint return with her husband in prior years, the surviving spouse has a few options. They can file a joint return for the partial year, report Patricia’s income on their individual return, or file a separate return for Patricia. Generally, filing jointly is the most advantageous route, but it requires careful calculation to ensure accuracy. A surviving spouse has until the original due date of their tax return to make this decision.

What About Capital Gains and the Step-Up in Basis?

This is where my CPA background truly comes into play. When assets are inherited, they receive a “step-up” in basis to their fair market value on the date of death. This means any capital gains taxes are calculated based on the difference between the sale price and the stepped-up basis, potentially significantly reducing the tax liability. Properly documenting the fair market value on the date of death is essential. We often engage qualified appraisers to establish accurate valuations, and understanding capital gains rates—both short-term and long-term—is vital to minimize taxes. Failing to understand this benefit can lead to substantial overpayment of taxes.

Are There Any Deductions or Credits Available?

Yes. Standard deductions and credits still apply to the final tax return. However, there are also some estate-specific deductions, such as funeral expenses and estate administration costs. Furthermore, if the estate qualifies, you may be able to deduct qualified business income (QBI). The estate may also be able to utilize any net operating losses (NOLs) carried over from prior years.

What Forms Do I Need to File Besides Form 1040?

Depending on the complexity of the estate, you might need to file additional forms, such as Schedule B for interest and dividends, Schedule D for capital gains, Schedule E for rental income, and Form 4797 for sales of business property. If the estate is substantial, you may also need to file Form 706, the Federal Estate Tax Return, even if no estate tax is owed. Remember, as of Jan 1, 2026, the Federal Estate Tax Exemption is permanently $15 million per person ($30 million for couples) thanks to the One Big Beautiful Bill Act (OBBBA). However, California executors must still file Form 706 to elect ‘portability’ for a surviving spouse, even if no tax is currently owed.

What’s the Deadline for Filing the Final Tax Return?

Generally, the final tax return is due on the normal filing date – April 15th of the following year. However, if you request an extension, you can file up to six months later. It’s important to note that an extension to file does not extend the time to pay any taxes owed.

Can I Be Personally Liable for Mistakes on the Final Tax Return?

As an executor, you have a fiduciary duty to accurately file the final tax return. While unintentional errors are usually not subject to penalties, gross negligence or intentional misrepresentation can result in personal liability. This is why seeking professional guidance is paramount.

For deaths on or after April 1, 2025, executors may avoid full probate for personal property under $208,850. Notably, AB 2016 now allows a simplified ‘Petition to Determine Succession’ for a primary residence valued up to $750,000. Per Probate Code § 13050, you MUST exclude all California-registered vehicles and up to $20,875 in unpaid salary from the small estate calculation.

How do probate courts in California evaluate intent when a will is challenged?

In California, a last will and testament operates within a probate system that emphasizes intent, clarity, and procedural compliance. When properly drafted, a will does more than distribute property—it creates legally enforceable instructions that guide courts, fiduciaries, and beneficiaries through administration with fewer disputes and less uncertainty.

For California residents, understanding how intent, authority, and compliance interact is one of the most effective ways to protect family harmony and estate integrity. A will that anticipates probate scrutiny is far more likely to be honored as written and far less likely to become the source of unnecessary conflict.

Official Legal Standards and Resources for California Executors

• Mandatory Judicial Forms:
  Judicial Council of California – Probate Forms (DE Series)
  The official repository for all “Decedents’ Estates” forms; in 2026, this includes mandatory updated forms for the $208,850 Small Estate threshold and the new AB 2016 simplified petitions for primary residences valued under $750,000.
• Riverside County Local Rules:
  Riverside Superior Court – Executor FAQ
  A localized resource for Riverside County fiduciaries that outlines 2026 requirements for mandatory e-filing, Local Rule 7010 for remote appearances, and specific duties regarding the 4-month creditor claim period.
• Federal Tax Compliance:
  IRS Guidelines for Executors (Form 706 & 1041)
  The authoritative federal guide for filing a final 1040 and the estate’s 1041; it reflects the 2026 OBBBA update, which established a permanent $15 million individual estate tax exemption, effectively ending the previous “tax cliff” uncertainty.
• Statutory Duty of Care:
  California Probate Code § 9600 (The Prudent Person Rule)
  Codifies the “Prudent Person Rule,” stipulating that an executor must manage estate assets with reasonable care and skill; it remains the primary legal standard in 2026 for determining if a fiduciary is liable for mismanagement or “surcharge.”
• Digital Asset Authority:
  Revised Uniform Fiduciary Access to Digital Assets Act (RUFADAA)
  Access California Probate Code §§ 870-884, which governs an executor’s power to manage online accounts; it clarifies why service providers can legally block access to private emails and crypto-wallets without explicit “prior consent” in the estate plan.